x86/kernel/cpuid.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* ----------------------------------------------------------------------- *
4  *   Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
6  * ----------------------------------------------------------------------- */
16  * and the upper 32 bits of the file position as the incoming %ecx,
54 	cpuid_count(cmd->regs.eax, cmd->regs.ecx,  in cpuid_smp_cpuid()
55 		    &cmd->regs.eax, &cmd->regs.ebx,  in cpuid_smp_cpuid()
56 		    &cmd->regs.ecx, &cmd->regs.edx);  in cpuid_smp_cpuid()
58 	complete(&cmd->done);  in cpuid_smp_cpuid()
72 		return -EINVAL;	/* Invalid chunk size */  in cpuid_read()
75 	for (; count; count -= 16) {  in cpuid_read()
81 		cmd.regs.ecx = pos >> 32;  in cpuid_read()
88 			err = -EFAULT;  in cpuid_read()
107 		return -ENXIO;	/* No such CPU */  in cpuid_open()
110 	if (c->cpuid_level < 0)  in cpuid_open()
111 		return -EIO;	/* CPUID not supported */  in cpuid_open()
128 	return kasprintf(GFP_KERNEL, "cpu/%u/cpuid", MINOR(dev->devt));  in cpuid_devnode()
159 		return -EBUSY;  in cpuid_init()